Pocket Botanist
Check these first
- Inspect the undersides of the leaves for orange or brown spots.
- Look for a white powdery film on the top of the leaves.
- Check if the plant is crowded by other vegetation.
Likely causes
Rust
Most likelyHow to tell: You will see small orange or brown pustules on the undersides of the leaves. These spots can eventually cause the foliage to yellow and drop.
What to do: Remove and destroy the affected leaves immediately to stop the spread. Improve air circulation by thinning out crowded stems and avoid overhead watering.
Powdery Mildew
Most likelyHow to tell: A white, dusty coating appears on the surface of the leaves. It looks like someone sprinkled flour on your plant.
What to do: Prune away the worst affected parts to increase airflow. Apply a neem oil spray or a mixture of water and baking soda to the foliage in the early morning.
Find out what's wrong with your goldenrod
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
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When to worry
Worry if the spots cover more than half the plant or if the leaves start dying off rapidly. A few spots are normal in humid weather but should be managed quickly.
Stopping it coming back
Space your Goldenrod plants well to ensure good airflow and always water at the base of the plant rather than over the leaves.
Goldenrod: spots? Check yours with a photo
Every plant is a little different. Take a photo of your goldenrod and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.
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Questions people ask
- Will these spots kill my Goldenrod?
- Usually not, but they can weaken the plant and make it look unsightly. If left untreated, the plant may lose its vigor and fail to bloom well.
- Can I compost the spotted leaves?
- No, do not put them in your compost pile. The fungal spores can survive and spread back to your garden next season.
Guides to these causes
More problems with Goldenrod
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.